:root {
  --bg: #0f1117;
  --bg-side: #161a23;
  --bg-card: #1b202b;
  --fg: #d7dce4;
  --fg-dim: #9aa3b2;
  --accent: #76b900;
  --accent2: #4a9eff;
  --border: #2a3040;
  --code-bg: #0a0c12;
  --sidebar-w: 260px;
  --content-max: 960px;
  --content-max-wide: 1280px;
  --content-max-4k: 1600px;
  --font-base: 16px;
  --font-scale: 1;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.6;
  display: flex;
  min-height: 100vh;
  font-size: var(--font-base);
}
nav.sidebar {
  width: var(--sidebar-w);
  flex-shrink: 0;
  background: var(--bg-side);
  border-right: 1px solid var(--border);
  padding: 20px 0;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
}
nav.sidebar .brand {
  padding: 0 20px 16px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 12px;
}
nav.sidebar .brand .logo { font-size: 20px; font-weight: 700; color: var(--accent); }
nav.sidebar .brand .sub { font-size: 12px; color: var(--fg-dim); }
nav.sidebar a {
  display: block;
  padding: 8px 20px;
  color: var(--fg-dim);
  text-decoration: none;
  font-size: 14px;
  border-left: 3px solid transparent;
}
nav.sidebar a:hover { color: var(--fg); background: rgba(255,255,255,0.03); }
nav.sidebar a.active { color: var(--accent); border-left-color: var(--accent); background: rgba(118,185,0,0.08); }
main {
  flex: 1;
  padding: 40px 48px;
  max-width: var(--content-max);
  margin: 0 auto;
  min-width: 0;
}
main h1 { color: var(--accent); border-bottom: 1px solid var(--border); padding-bottom: 12px; }
main h2 { color: var(--accent2); margin-top: 32px; }
main h3 { color: var(--fg); margin-top: 24px; }
main h4 { color: var(--fg-dim); }
main a { color: var(--accent2); }
main code {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 1px 5px;
  font-family: "SF Mono", "Cascadia Code", Consolas, monospace;
  font-size: 0.9em;
}
main pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px;
  overflow-x: auto;
  max-width: 100%;
}
main pre code { background: none; border: none; padding: 0; }
main table { border-collapse: collapse; width: 100%; margin: 16px 0; }
main th, main td { border: 1px solid var(--border); padding: 8px 12px; text-align: left; }
main th { background: var(--bg-card); color: var(--accent2); }
main tr:nth-child(even) td { background: rgba(255,255,255,0.02); }
main blockquote {
  border-left: 4px solid var(--accent);
  margin: 16px 0;
  padding: 4px 16px;
  background: rgba(118,185,0,0.06);
  color: var(--fg-dim);
}
main hr { border: none; border-top: 1px solid var(--border); margin: 24px 0; }
main ul, main ol { padding-left: 24px; }
main li { margin: 4px 0; }
.badge { display:inline-block; background: var(--bg-card); border:1px solid var(--border); border-radius:20px; padding:2px 12px; font-size:12px; color:var(--fg-dim); margin-right:6px; }
.hero { background: linear-gradient(135deg, rgba(118,185,0,0.12), rgba(74,158,255,0.08)); border:1px solid var(--border); border-radius:12px; padding:28px; margin-bottom:28px; }
.hero h1 { border:none; padding:0; margin:0 0 8px; }
.hero p { color: var(--fg-dim); margin:0; }
.card-grid { display:grid; grid-template-columns: repeat(auto-fill, minmax(240px,1fr)); gap:16px; margin:24px 0; }
.card { background: var(--bg-card); border:1px solid var(--border); border-radius:10px; padding:18px; text-decoration:none; color:var(--fg); transition: border-color .15s; }
.card:hover { border-color: var(--accent); }
.card h3 { margin:0 0 6px; color: var(--accent2); font-size:16px; }
.card p { margin:0; font-size:13px; color: var(--fg-dim); }
footer { margin-top: 48px; padding-top: 16px; border-top: 1px solid var(--border); color: var(--fg-dim); font-size: 13px; }

/* Mobile menu toggle button (hidden on desktop) */
.menu-toggle {
  display: none;
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 1000;
  background: var(--bg-side);
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 12px;
  font-size: 20px;
  line-height: 1;
  cursor: pointer;
}
.menu-toggle:hover { border-color: var(--accent); color: var(--accent); }

/* Table scroll wrapper for small screens */
.table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; }

/* ============================================================
   RESPONSIVE BREAKPOINTS
   ============================================================ */

/* ---------- Mobile (< 768px) ---------- */
@media (max-width: 767px) {
  body { flex-direction: column; }
  .menu-toggle { display: block; }
  nav.sidebar {
    width: 100%;
    height: auto;
    position: fixed;
    top: 0;
    left: 0;
    z-index: 999;
    transform: translateX(-100%);
    transition: transform .25s ease;
    padding-top: 56px;
    max-height: 100vh;
    overflow-y: auto;
  }
  nav.sidebar.open { transform: translateX(0); }
  main { padding: 56px 16px 24px; }
  main h1 { font-size: 1.5rem; }
  main h2 { font-size: 1.25rem; }
  main h3 { font-size: 1.1rem; }
  .hero { padding: 20px; }
  .card-grid { grid-template-columns: 1fr; }
  main pre { padding: 12px; font-size: 0.85em; }
  /* Make wide tables horizontally scrollable on mobile without markup changes */
  main table { display: block; overflow-x: auto; -webkit-overflow-scrolling: touch; white-space: nowrap; }
  footer { font-size: 12px; }
}

/* ---------- Tablet (768 - 1024px) ---------- */
@media (min-width: 768px) and (max-width: 1024px) {
  nav.sidebar { width: 220px; }
  main { padding: 32px 28px; }
  main h1 { font-size: 1.6rem; }
  main h2 { font-size: 1.3rem; }
  .card-grid { grid-template-columns: repeat(auto-fill, minmax(200px,1fr)); }
}

/* ---------- Desktop (1024 - 1280px) ---------- */
@media (min-width: 1025px) and (max-width: 1279px) {
  main { padding: 40px 40px; }
}

/* ---------- Large desktop / TV (1280 - 1920px) ---------- */
@media (min-width: 1280px) and (max-width: 1919px) {
  main { max-width: var(--content-max-wide); padding: 48px 56px; }
  body { font-size: calc(var(--font-base) * 1.05); }
  nav.sidebar { width: 280px; }
  .card-grid { grid-template-columns: repeat(auto-fill, minmax(260px,1fr)); }
}

/* ---------- 4K TV / Ultra-wide (1920px+) ---------- */
@media (min-width: 1920px) {
  main { max-width: var(--content-max-4k); padding: 56px 72px; }
  body { font-size: calc(var(--font-base) * 1.15); }
  nav.sidebar { width: 320px; }
  nav.sidebar a { font-size: 16px; padding: 10px 24px; }
  nav.sidebar .brand .logo { font-size: 24px; }
  nav.sidebar .brand .sub { font-size: 14px; }
  .card-grid { grid-template-columns: repeat(auto-fill, minmax(300px,1fr)); }
  main h1 { font-size: 2rem; }
  main h2 { font-size: 1.6rem; }
  main h3 { font-size: 1.3rem; }
  main pre { font-size: 1em; }
  main th, main td { padding: 10px 16px; }
  .badge { font-size: 14px; }
  .hero { padding: 36px; }
}

/* ---------- Very large 4K (2560px+) ---------- */
@media (min-width: 2560px) {
  main { max-width: 1800px; }
  body { font-size: calc(var(--font-base) * 1.25); }
  nav.sidebar { width: 360px; }
}